<header class="light" style="background-image: url('http://pingodata.qiniudn.com/cube-header.jpg');">
    <div class="intro">
        <h1>{{ site.title }}</h1>
        <p>{{ site.description  }}</p>
        {% set headUrl = "/img/logo_128x128.png" %}
    	{% if site.author.avatar %}
    		{% set headUrl = site.author.avatar %}
    	{% endif %}
        <a href="{{ site.url }}"><img src="{{ headUrl }}" alt="avatar"/></a>
     </div></header>
        <div style="position: relative;text-align: center;width:80%;margin-left:15%;top:-20px;z-index:999999;">
        <div style="float:left;width:50%;margin-top:0px;text-align: left;">
          <ul class="nav navbar-nav">
	 <li class="dropdown">
          <a style="clear:both" href="#" class="dropdown-toggle" data-toggle="dropdown">操作系统<b class="caret"></b></a>
          <ul class="dropdown-menu">
            <li><a href="/category/1752954334.html">Linux</a></li>
            <li class="divider"></li>
            <li><a href="/category/2004609611.html">Linux基础</a></li>
            <li><a href="#">Linux安全</a></li>
            <li><a href="#">linux应用</a></li>
            <li><a href="/category/2628734136.html">linux服务</a></li>
            <li><a href="#">Linux系统优化</a></li>
            <li><a href="/category/2165081386.html">无线技术</a></li>
            <li class="divider"></li>
            <li><a href="/category/1828756791.html">Windows</a></li>
            <li class="divider"></li>
            <li><a href="#">Windows工具</a></li>
          </ul> 
         </li>
		<li class="dropdown">
          <a style="clear:both" href="#" class="dropdown-toggle" data-toggle="dropdown">数据库<b class="caret"></b></a>
          <ul class="dropdown-menu">
            <li><a href="/category/2488021733.html">MySQL</a></li>
	    <li class="divider"></li>
            <li><a href="/category/1049233538.html">Oracle</a></li>
          </ul>
         </li>
 		<li class="dropdown">
          <a style="clear:both" href="#" class="dropdown-toggle" data-toggle="dropdown">编程<b class="caret"></b></a>
          <ul class="dropdown-menu">
            <li><a href="/category/2286085968.html">C#</a></li>
            <li class="divider"></li>
            <li><a href="/category/192703327.html">Django</a></li>
            <li class="divider"></li>
            <li><a href="/category/88834407.html">Python</a></li>
            <li class="divider"></li>
            <li><a href="#">C/C++</a></li>
            <li class="divider"></li>
            <li><a href="/category/3096058031.html">Shell</a></li>
            <li class="divider"></li>
            <li><a href="/category/379311926.html">Web前端</a></li>
            </ul>
           </li>
            <li class="dropdown">
          <a style="clear:both" href="#" class="dropdown-toggle" data-toggle="dropdown">其它<b class="caret"></b></a>
          <ul class="dropdown-menu">
            <li><a href="/category/948787488.html">FQA</a></li>
	    <li class="divider"></li>
            <li><a href="/search?keyword=总结">总结</a></li>
	    <li class="divider"></li>
	     <li><a href="/category/1628854555.html">我们的作品</a></li>
          </ul>
           </li>
         </ul>
	</div>
        <form class="search" action="/search" method="get" style="width:45%;float:right;">
                <fieldset>
                        <div class="text">
                                <input name="keyword" id="keyword" type="text" placeholder="请输入关键字 ..."/>
                                <button class="btn">搜 索</button>
                        </div>
                </fieldset>
        </form>
        </div>
